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a Sample of MgCl2 is known to be contaminated with NaCL. A 3.47 portion of the sample is dissolved in water and treated with an excess AgNO3 solution. THe precipitate is filtered off, dried and weighed. The dried precipitate weighs 10.3g. Calculate the amunt of MgCl2 in the original sample (in weight percent).
if you have 4 moles of hydrogen gas, how many moles of oxygen gas are needed for complete reaction?
A mixture of nitrogen and hydrogen was allowed to come to equilibrium at a given temperature according to 3H2+N2 2NH3. At equilibrium, the mixture contained
A solution formed by mixing 11.0 ml of 0.110 M HBr with 25.0 Ml of 0.190 M HCl. what is the ph of the strong acid?
What is the the molar composition of the products when a stream of CH4 is combusted with 5% excess air if you have 1600 moles per hour of methane being fed into the reactor
An aqueous solution of unoxygenated hemoglobin containing 5 g of protein (M= 64000 g/mol) in the 100cm3 of solution is placed in an insulated vessel.
How many grams of formic acid, HCOOH, must be added to 0.100 L of 0.130 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.40? Assume no volume change. Ka of HCOOH = 5.0 10-4.
in the electrolysis of a sodium chloride solution, what volume of H2 is produced in the same time it takes to produce 257L of Cl2, with both volumes measured at 50 celcius degrees and 2.50atm
Draw a rough sketch of the energy profile for each of the following cases. a. E = +10 kJ/mol, Ea = 25 kJ/mol b. E = -10 kJ/mol, Ea = 50 kJ/mol c.
How could you ascertain wheter the alcohol or the carboxylic acid furnishes the hydroxyl group that appears in the molecule of water
what is the standard free energy change for thisreaction? Substance ?G°f (kJ/mol) CH3CH2OH(l) - 174.9 O2(g) 0 CO2(g) -394.4 H2O(g) -228.6 Express the free energy change inkilojoules using five significant figures. ?G° = ? kJ
calculate the solubility of Ca(OH)2 in a 0.469M Cacl2 solution at 31 Degrees, given the Ksp of Ca(OH)2 is 4.96*10^-6. give answer in milli molar units.
With what minimum speed must Fran leave the ground in order to lift her center of mass 1.95 m and cross the bar with a speed of 0.70 m/s?
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